A comparison of Antarctic euphausiids sampled by net and from geothermally heated waters: insights into sampling bias
The Antarctic euphausiids Euphausia superba and E. crystallorophias were sampled using an 8 m2 rectangular midwater trawl inside the caldera of Deception Island. Specimens of the same species were collected on the same day from the strandline and sublittoral fringe within the caldera at a bay where...
| Published in: | Polar Biology |
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| Main Author: | |
| Format: | Article in Journal/Newspaper |
| Language: | unknown |
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Springer-Verlag
1999
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| Online Access: | http://nora.nerc.ac.uk/id/eprint/503042/ http://link.springer.com/content/pdf/10.1007%2Fs003000050397.pdf https://doi.org/10.1007/s003000050397 |
| Summary: | The Antarctic euphausiids Euphausia superba and E. crystallorophias were sampled using an 8 m2 rectangular midwater trawl inside the caldera of Deception Island. Specimens of the same species were collected on the same day from the strandline and sublittoral fringe within the caldera at a bay where these euphausiids had been incapacitated by high temperature geothermally heated waters. Differences between length frequency distributions of samples obtained by both methods were investigated once net-caught specimens had been subject to the simulated effects of geothermally heated waters. Differences between maturity stage/sex ratios for E. superba samples were also assessed. No significant differences between sizes of net-caught or beach-sampled E. crystallorophias were detected, but significant differences were found between both the sizes and sex/maturity stages for E. superba samples. Possible explanations for these differences are discussed. |
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